Katie is an ordinary girl who longs for an extraordinary pet--something more spectacular than a simple goldfish. Then one day Katie comes home to find a gift from her mother: a mysterious machine designed to help her create that one-of-a-kind creature. Each time she feeds different items into the machine, out comes a marvelously colorful new animal--like a purple monkey, rainbow-spotted horse, and green bunny! But none of them is just right. Through trial and error, Katie figures out the formula for her absolutely perfect SURPRISE pet.